cray-dar

Noun

 * 1)  The ability to detect whether or not a person is crazy.
 * 2) * 2012, Catherine Alvarez-McCurdy, "Halloween Costumes: Least To Most Fuckable", The Chicago Shady Dealer (humor magazine of The University of Chicago), Volume 9, Issue 2, 5 November 2012, page 3:
 * Someone who likes whips and bondage just as much as you will probably be at the party too; I’m sure your cray-dar will start beeping soon.